Samson V2001 Series, Mounting And Operating Instructions

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EB 8135/8136 EN 11
Operation
4 Operation
The operating instructions only apply in con-
junction with the actuator. Refer to the corre-
sponding mounting and operating instruc-
tions.
5 Maintenance
The control valve is subject to normal wear,
especially at the seat, plug, bellows, and
packing.
Depending on the operating conditions,
check the valve at regular intervals to pre-
vent possible failure before it can occur.
External leakage can indicate that the bel-
lows seal or packing is defective.
If the valve does not close tightly, tight shut-
off may be impaired by dirt stuck between
the seat and plug or by damaged facings.
Valves in DN 15 to 25 have a one-pieced
plug, which is used for mixing and diverting
valves using the same arrangement.
In valves ≥DN 32, two V-port plugs are
used. In mixing valves, the plugs are guided
in the seats from the inside. Whereas, in di-
verting valves, they are guided into the seats
from the outside.
To keep the exact position of the plug, spacer
sleeves are used to keep the plug on the plug
stem. The different arrangement for valves in
DN 32 to 50 and for valves in DN 65 and
80 as mixing and diverting valves is de-
scribed in the section on assembly.
We recommend removing the parts, cleaning
them, and, if necessary, replacing them with
new ones.
WARNING!
−
Before performing any work on the
control valve, make sure the rele-
vant plant section has been depres-
surized and, depending on the
process medium, drained as well.
− When used at high temperatures,
allow the plant section to cool
down to ambient temperature.
− Make sure the electrical or pneu-
matic control signal for the actuator
is switched off. Remove the signal
pressure line of a pneumatic actua-
tor.
−
Valves are not free of cavities. As a
result, residual process medium
might still be contained in the
valve.
− We recommend removing the valve
from the pipeline.
NOTICE
Before performing any repair work,
remove the actuator from the valve.
Unscrew the screws on the stem con-
nector (7) and the nut (9). Lift the ac -
tuator off the valve (see Fig. 1).
Note:
The required tightening torques are
specified in the following instructions.
Suitable seat wrenches are addition-
ally listed in section 5.3.
